A member of Willie Nelson's band since 1973, Mickey Raphael has become one of the most celebrated harmonica players in country music, bending notes for everyone from Chris Stapleton to Jason Isbell along the way. Talking with podcast host Chris Shiflett during this week's episode of Walking the Floor, he shares highlights from more than four decades of countrified close encounters, from the Texas picking party where he first met Shotgun Willie to the California tour stop that found him sitting in the backseat of Neil Young's Cadillac, chauffeured around San Jose by the Crazy Horse frontman himself.

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The episode was recorded inside the Hollywood Pantages Theatre, hours before a Willie Nelson performance this past October. Stream the entire conversation below. We've also rounded up several highlights, from the name of Willie Nelson's next record – an album that has yet to be officially announced – to unknown guests on the country legend's tour bus.

Mickey Raphael was introduced to Willie Nelson not by a fellow musician, but by Coach Darrell Royal, who led the Texas Longhorns to nearly a dozen Southwest conference titles between 1957 and 1976.

The year was 1972. At the time, Raphael was gigging with B.W. Stevenson, whose "My Maria" would eventually become a Grammy-winning hit for Brooks & Dunn. Stevenson's tour schedule often took the band through Austin, where Coach Royal – a genuine music fan, apparently – caught wind of Raphael's talent. One day, the coach reached out, inviting Raphael to a picking party that he was throwing in his hotel room after a weekend game.

"I was 20 years old," remembers Raphael, who brought along his harmonicas. When he arrived, Nelson was already at the party. The two played several songs together that afternoon, with Raphael earning a crucial invitation – "Willie said, 'Hey, if you ever hear we're playing somewhere, come sit in,'" he remembers – before the picking party was over.

Nelson never officially hired Raphael to play in his band. He just never asked him to stop showing up.

As early as 1973, Raphael was traveling in his own car to Nelson's gigs, sitting in with the band whenever he could. He was just a guest at first, although he quickly became an indispensable part of the band's sound. Even so, the harmonica wiz never received any sort of grand introduction into the inner circle of Nelson's touring lineup.

"One day," he remembers, "Willie says to Paul [English, the singer's longtime drummer], 'What are we paying Mickey?' And Paul goes, 'Nothing. He's just coming to sit in.' And Willie goes, 'Double his salary.' I tell people I wasn't officially hired; I was just never asked to leave."

Raphael first joined Nelson in the studio for 1975's Red Headed Stranger, an album that was so sparse, the executive at Columbia Records thought it was a demo.

"[Nelson] basically had these songs written on a napkin," says Raphael, who took the band to the same Dallas studio where he'd been doing regular work as a session musician, "and we just set up in a circle in the studio, and he'd be playing them, and that record is so sparse because we're really just hearing them for the first time. There's barely anything. . . The label said it was a good demo, and they wanted to put strings on it, and Willie said, 'No, this is the record.'"

Producer Dave Cobb deserves credit for first introducing Raphael to Chris Stapleton, whose live shows often feature the harmonica wiz.

Raphael had already played harmonica on several of Cobb's projects when the producer asked him to join a relatively unknown songwriter named Chris Stapleton in the studio. Those sessions spawned Traveller, Stapleton's blockbuster solo debut. They also landed Raphael one of his most high-profile touring gigs. Now, whenever holes arise in Willie Nelson's touring schedule, Raphael generally hits the road with Stapleton, although he readily admits the band sounds just fine without him.

"He loves it," says Raphael, who still plays more than 100 shows a year with Nelson. "He likes the connection with the audience. Somebody asked him one time, 'When are you gonna retire?' And he said, 'All I do is play golf and play music. Which one am I supposed to quit?'

Nelson continues releasing new albums at a rapid rate, too, with a new record – the unannounced, unconfirmed God's Problem Child – apparently in the can. That said, with all the commotion generated by a consistent touring schedule and, presumably, a healthy cannabis intake, there's still plenty of room for the unexpected.

"There was a guy that rode our bus years ago that nobody even knew," Raphael remembers with a laugh. "It was like, 'I thought he was with you.' 'No, I thought he was your friend!'"